JPH0416826B

PURPOSE:To obtain a versatile and natural man-machine interface by recognizing the conversion of a topic on the basis of an interactive pair dictionary by switching an interactive pair stack to control the topics. CONSTITUTION:A topic controller 2 accesses the interactive pair dictionary 5 on the basis of the analyzed result of a user input to obtain an interactive pair 13 from the dictionary 5. Then, the preceding user input analyzing result 7 is compared with the corrent one, and when a center object or the operating contents of the object coincide with each other, the input is decided as different expression. When the input is not different expression is decided, the topic controller 2 sends the interactive pair 13 to an interactive pair controller 3 to check whether the interactive pair is formed or not. When the interactive pair is not formed, the conversion of the topic is recognized and the interactive pair 13, a stack changing request and a registration request are sent to the controller 3. The success/failure of the registration request is decided by an interactive pair stack group 6.